Short-Cut Method to Assess a Gross Available Energy in a Medium-Load Screw Friction Press

Egea, Antonio J. Sánchez; Deferrari, N.; Abate, Germán; Krähmer, Daniel; Lacalle, Luís Norberto López de

doi:10.3390/met8030173

Cited by 11 publications

(6 citation statements)

References 12 publications

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“…Forging is a metal forming process widely used in industries, such as automotive, aerospace, railway, naval, oil, mining, and health [1,2]. Several parts are involved in this process: press, dies, material to be forged, lubrication system, and type of lubricant.…”

Section: Introductionmentioning

confidence: 99%

Surface Damaging of Brass and Steel Pins when Sliding over Nitrided Samples Cut by Finishing and Roughing EDM Conditions

et al. 2020

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In the forging industry, surface quality and surface treatments of dies are crucial parameters to extend their life. These components are usually machined by milling or by Electrical Discharge Machining (EDM), and the final surface roughness depends on the machining techniques and operational conditions used in its fabrication. After milling, a nitriding treatment is widely applied to extend its service life. Nevertheless, no scientific report that informs about nitriding after EDM has been found. Accordingly, this work focuses on the wear and friction behavior of pins made of brass and medium carbon steel sliding over AISI H13 discs, made by wire EDM in the conditions of finishing and roughing. The discs are plasma nitride, and their effect on the wear during pin-on-disc tests is evaluated. In this sense, the analysis of the surface damage for the different pins will help us to understand the service life and wear evolution of the forging dies. The results show that plasma nitride reduces the friction and prevents the degradation of the pin, independently of the material of the pin, when sliding over finishing and roughing EDM conditions.

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Section: Introductionmentioning

confidence: 99%

Surface Damaging of Brass and Steel Pins when Sliding over Nitrided Samples Cut by Finishing and Roughing EDM Conditions

et al. 2020

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“…No study, to our knowledge, has considered the optimum energy consumption and its profit for a smart production system, under advertising-and price-dependent demands. Egea et al [9] expressed, in a model, how to measure energy during the loading of a smart machine. González et al [10] proposed a model for turbo-machinery components, using a total energy consideration.…”

Section: Introductionmentioning

confidence: 99%

Multi-Product Production System with the Reduced Failure Rate and the Optimum Energy Consumption under Variable Demand

2019

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The advertising of any smart product is crucial in generating customer demand, along with reducing sale prices. Naturally, a decrease in price always increases the demand for any smart product. This study introduces a multi-product production process, taking into consideration the advertising- and price-dependent demands of products, where the failure rate of the production system is reduced under the optimum energy consumption. For long-run production systems, unusual energy consumption and machine failures occur frequently, which are reduced in this study. All costs related with the production system are included in the optimum energy costs. The unit production cost is dependent on the production rate of the machine and its failure rate. The aim of this study is to obtain the optimum profit with a reduced failure rate, under the optimum advertising costs and the optimum sale price. The total profit of the model becomes a complex, non-linear function, with respect to the decision variables. For this reason, the model is solved numerically by an iterative method. However, the global optimality is proved numerically, by using the Hessian matrix. The numerical results obtained show that for smart production, the maximum profit always occurs at the optimum values of the decision variables.

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“…González et al [8] developed a model on turbomachinery components which are using for grinding flank tools. Egea et al [9] implemented a short-cut method to measure the available energy in a required load capacity of a forging machine. They estimated the total energy during the friction of two screws.…”

Section: Introductionmentioning

confidence: 99%

Effect of Energy and Failure Rate in a Multi-Item Smart Production System

Sarkar

Iqbal

2018

Energies

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To form a smart production system, the effect of energy and machines’ failure rate plays an important role. The main issue is to make a smart production system for complex products that the system may produce several defective items during a long-run production process with an unusual amount of energy consumption. The aim of the model is to obtain the optimum amount of smart lot, the production rate, and the failure rate under the effect of energy. This study contains a multi-item economic imperfect production lot size energy model considering a failure rate as a system design variable under a budget and a space constraint. The model assumes an inspection cost to ensure product’s quality under perfect energy consumption. Failure rate and smart production rate dependent development cost under energy consumption are considered, i.e., lower values of failure rate give higher values of development cost and vice versa under the effect of proper utilization of energy. The manufacturing system moves from in-control state to out-of-control state at a random time. The theory of nonlinear optimization (Kuhn–Tucker method) is employed to solve the model. There is a lemma to obtain the global optimal solution for the model. Two numerical examples, graphical representations, and sensitivity analysis of key parameters are given to illustrate the model.

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Short-Cut Method to Assess a Gross Available Energy in a Medium-Load Screw Friction Press

Cited by 11 publications

References 12 publications

Surface Damaging of Brass and Steel Pins when Sliding over Nitrided Samples Cut by Finishing and Roughing EDM Conditions

Surface Damaging of Brass and Steel Pins when Sliding over Nitrided Samples Cut by Finishing and Roughing EDM Conditions

Multi-Product Production System with the Reduced Failure Rate and the Optimum Energy Consumption under Variable Demand

Effect of Energy and Failure Rate in a Multi-Item Smart Production System

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